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[SPARK-49966][SQL] Codegen Support for JsonToStructs(
from_json)
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.../main/scala/org/apache/spark/sql/catalyst/expressions/json/jsonExpressionEvaluators.scala
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You under the Apache License, Version 2.0 | ||
| * (the "License"); you may not use this file except in compliance with | ||
| * the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.apache.spark.sql.catalyst.expressions.json | ||
|
|
||
| import org.apache.spark.sql.catalyst.InternalRow | ||
| import org.apache.spark.sql.catalyst.expressions.ExprUtils | ||
| import org.apache.spark.sql.catalyst.expressions.variant.VariantExpressionEvalUtils | ||
| import org.apache.spark.sql.catalyst.json.{CreateJacksonParser, JacksonParser, JSONOptions} | ||
| import org.apache.spark.sql.catalyst.util.{FailFastMode, FailureSafeParser, PermissiveMode} | ||
| import org.apache.spark.sql.errors.QueryCompilationErrors | ||
| import org.apache.spark.sql.types.{ArrayType, DataType, MapType, StructField, StructType, VariantType} | ||
| import org.apache.spark.unsafe.types.UTF8String | ||
|
|
||
| class JsonToStructsEvaluator( | ||
| options: Map[String, String], | ||
| nullableSchema: DataType, | ||
| nameOfCorruptRecord: String, | ||
| timeZoneId: Option[String], | ||
| variantAllowDuplicateKeys: Boolean) extends Serializable { | ||
|
|
||
| // This converts parsed rows to the desired output by the given schema. | ||
| @transient | ||
| private lazy val converter = nullableSchema match { | ||
| case _: StructType => | ||
| (rows: Iterator[InternalRow]) => if (rows.hasNext) rows.next() else null | ||
| case _: ArrayType => | ||
| (rows: Iterator[InternalRow]) => if (rows.hasNext) rows.next().getArray(0) else null | ||
| case _: MapType => | ||
| (rows: Iterator[InternalRow]) => if (rows.hasNext) rows.next().getMap(0) else null | ||
| } | ||
|
|
||
| @transient | ||
| private lazy val parser = { | ||
| val parsedOptions = new JSONOptions(options, timeZoneId.get, nameOfCorruptRecord) | ||
| val mode = parsedOptions.parseMode | ||
| if (mode != PermissiveMode && mode != FailFastMode) { | ||
| throw QueryCompilationErrors.parseModeUnsupportedError("from_json", mode) | ||
| } | ||
| val (parserSchema, actualSchema) = nullableSchema match { | ||
| case s: StructType => | ||
| ExprUtils.verifyColumnNameOfCorruptRecord(s, parsedOptions.columnNameOfCorruptRecord) | ||
| (s, StructType(s.filterNot(_.name == parsedOptions.columnNameOfCorruptRecord))) | ||
| case other => | ||
| (StructType(Array(StructField("value", other))), other) | ||
| } | ||
|
|
||
| val rawParser = new JacksonParser(actualSchema, parsedOptions, allowArrayAsStructs = false) | ||
| val createParser = CreateJacksonParser.utf8String _ | ||
|
|
||
| new FailureSafeParser[UTF8String]( | ||
| input => rawParser.parse(input, createParser, identity[UTF8String]), | ||
| mode, | ||
| parserSchema, | ||
| parsedOptions.columnNameOfCorruptRecord) | ||
| } | ||
|
|
||
| final def evaluate(json: UTF8String): Any = { | ||
| if (json == null) return null | ||
| nullableSchema match { | ||
| case _: VariantType => | ||
| VariantExpressionEvalUtils.parseJson(json, | ||
| allowDuplicateKeys = variantAllowDuplicateKeys) | ||
| case _ => | ||
| converter(parser.parse(json)) | ||
| } | ||
| } | ||
| } |
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